putting gasket

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how big is the gap?
 
Thin gasket might work. Stove shops would have or perhaps online. I bought that kind once and it had a sticky strip on one side. I’m guessing putting it in gently with a flathead screwdriver would be good.
 
Is the opening round or square? If round, I don't think a flat gasket would work. It would kink trying to make the radius. You could probably cut one out of ceramic fiber. It would need a precisely cut, thin, round, high-temp gasket. I'd just use the cement.